Reversing-valve gear



( No Model.)

B. 1). M LEAN.

I REVERSING VALVE GEAR. 7 No. 295.033. Patented Mar. 11, 1884.

' UNITIEII- STATES PATENT CFFIGEO EDWIN n. MOLEAN, or AnIss A, ILLINOIS.

REVERSlNG-VALVE GEAR.

SPECIFICATION forming part of Letters Patent No. 295,033, dated March11, 1884.

- Application filed September 28, 1883. (No model.)

T0 on whom it may concern:

Beit known that I, EDWIN D. MOLEAN, of Marissa, in the county of St.Clair and State of Illinois, have invented a certain new and usefulReversing-Valve Gear for Steam-Engines, of which the following is afull, clear, and ex act description, reference being bad to theaccompanying drawings, forming part of thisspecification.

Reference is made to the claims for stateinent of invention.

Figures 1 and 2 are top views of my improvement, showing the eccentricin opposite positions upon the crank-shaft. Parts are broken away toexhibit other parts beneath. Fig. 3 is a detail view of the slidingsleeve. Fig. 4 is a transverse section at 4 4, Fig. 1. Fig. 5 is atransverse section at 5 5, Fig. 1. Fig. 6 is a transverse section at 66,Fig. 1, and Fig. 7 is a transverse section at 7 7, Fig. 2. Fig. 8 is aside view of the cam-pin in the eccentricsleeve.

The device is for the purpose of turning the eccentric upon the main (orcrank) shaft of the engine so that the movement of thevalve, andconsequently the rotation of the shaft, is reversed.

A is the main shaft of a steanrengine, ro tated by pitman B and crank O.

D is the pillow-block.

E is a sleeve sliding endwise upon the shaft A, and which hasfeather-key connection with v the shaft by means of a key,

F, upon the sleeve,

and a seat or groove, G, in the shaft, or vice versa.

H is a circumferential groove of the sleeve E, which receives the studs1; upon the forked end of the bell-crank lever I, so that by movement ofthe lever the sleeve is caused to slide upon the main shaft. (See. Figs.1 and 2.) The lever is moved by means of a connectingrod, J, handand-lever K. The latter is held in the desired position in anywell-known or suitable way. I have shown a notched bar, L, thearrangement being such that the lever springs into any one of thenotches with which it is brought in connection.

.M is a part of the slide-valve rod; N, the eccentric-yoke, and O theeccentric. The eccentric is fixed to a'sleeve, P, that fits easily onthe sleeve E, so that the latter can move groove or slot, E,

to turn upon the-main or crank shaft.

beneath it. In addition to its bearing upon the sleeve E, theeccentric-sleeve P has bearing upon a collar, Q, that is fixed to themain shaft by a set-screw, B. This set-screw projects outward beyond thecircumference of the collar, and carries a. friction-roller, r, that 00-cupies a circumferentially-extending slot, 11, in the sleeve P. The slothas sufficient length to allow of the eccentric-sleeve making therequired turning movement relatively to the crank-shaft A. The sleeve Ehas a spiral extending, say, one-half around it, the ends of the slot orgroove being preferably parallel with the axis as shown in Figs. land2,.so that the strain of the crankshaft upon the eccentric will not tendto move the sleeve E endwise upon the shaft.

S is a screw fixed in the sleeve P, and carry ing at its inner end afriction-wheel, s, that enters-the slot or groove E, so that the endwisemovement of the sleev'eE upon the shaft causes the friction-whee1 totravel along the slot or groove, and thus causes the eccentricsleeve PThe endwise movement of the eccentric-sleeve is prevented by thefriction pin or screw R r occupying the slot 1).

The collar Qneed not be made of a separate piece from the shaft A, butmay be made in one piece therewith.

I claim as my invention- 1. An eccentric having a sleeve formed withcircumferentially-extending slot, to receive a radial pin on the shaftand permit the sleeve to be turned.

2. The combination of an eccentric having of the shaft, 6 5

a sleeve formed with circumferentially-extending slot a shaft, a radialpin occupying said slot, a cam-sleeve to slide endwise and keyed to theshaft, spiral groove and pin connection for the sleeves, and means toretain the eccentric to desired position.

3. The combination of an eccentric having a sleeve formed withcircumferentially-extending slot and a radial pin, a crank-shaft havinga feather longitudinally thereof, a collar intermediate of theeccentric-sleeve and crankshaft, having a screw occupying thecircumferentially-extending slot, and securing the collar to thecrank-shaft, a camsleeve in line sleeve, 13, and cam-pin in theeccentric-sleeve working in the spiral cam groove or slot E of sleeve1*], and the pin or screw R, working in slot 1) of the eccentric-sleeve.

5. The combination of shaft A, eccentric and sleeve 0 I, having slot 2,studs or screws R and S, cam-sleeve E, with cam groove or slot E andgroove H, and the operating device I JK, all substantially as and forthe purpose set forth.

EDWIN 1'). )IQLEAN. \Vitnesses:

JOHN W. WELLs, W. F. ALLEN.

